21243524529 has 16 divisors (see below), whose sum is σ = 28407833280. Its totient is φ = 14120843520.

The previous prime is 21243524527. The next prime is 21243524537. The reversal of 21243524529 is 92542534212.

It is not a de Polignac number, because 21243524529 - 2¹ = 21243524527 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21243524527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1541389 + ... + 1555109.

It is an arithmetic number, because the mean of its divisors is an integer number (1775489580).

Almost surely, 2^21243524529 is an apocalyptic number.

It is an amenable number.

21243524529 is a deficient number, since it is larger than the sum of its proper divisors (7164308751).

21243524529 is a wasteful number, since it uses less digits than its factorization.

21243524529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15200.

The product of its digits is 172800, while the sum is 39.

The spelling of 21243524529 in words is "twenty-one billion, two hundred forty-three million, five hundred twenty-four thousand, five hundred twenty-nine".